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Appressoria-Small but Incredibly Powerful Structures in Plant-Pathogen Interactions. Int J Mol Sci 2023; 24:ijms24032141. [PMID: 36768468 PMCID: PMC9917257 DOI: 10.3390/ijms24032141] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 01/16/2023] [Accepted: 01/18/2023] [Indexed: 01/25/2023] Open
Abstract
Plant-pathogenic fungi are responsible for many of the most severe crop diseases in the world and remain very challenging to control. Improving current protection strategies or designating new measures based on an overall understanding of molecular host-pathogen interaction mechanisms could be helpful for disease management. The attachment and penetration of the plant surface are the most important events among diverse plant-fungi interactions. Fungi evolved as small but incredibly powerful infection structure appressoria to facilitate attachment and penetration. Appressoria are indispensable for many diseases, such as rusts, powdery mildews, and blast diseases, as well as devastating oomycete diseases. Investigation into the formation of plant-pathogen appressoria contributes to improving the understanding of the molecular mechanisms of plant-pathogen interactions. Fungal host attachment is a vital step of fungal pathogenesis. Here, we review recent advances in the molecular mechanisms regulating the formation of appressoria. Additionally, some biocontrol agents were revealed to act on appressorium. The regulation of fungal adhesion during the infective process by acting on appressoria formation is expected to prevent the occurrence of crop disease caused by some pathogenic fungi.
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Chethana KWT, Jayawardena RS, Chen YJ, Konta S, Tibpromma S, Phukhamsakda C, Abeywickrama PD, Samarakoon MC, Senwanna C, Mapook A, Tang X, Gomdola D, Marasinghe DS, Padaruth OD, Balasuriya A, Xu J, Lumyong S, Hyde KD. Appressorial interactions with host and their evolution. FUNGAL DIVERS 2021. [DOI: 10.1007/s13225-021-00487-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Chethana KWT, Jayawardena RS, Chen YJ, Konta S, Tibpromma S, Abeywickrama PD, Gomdola D, Balasuriya A, Xu J, Lumyong S, Hyde KD. Diversity and Function of Appressoria. Pathogens 2021; 10:pathogens10060746. [PMID: 34204815 PMCID: PMC8231555 DOI: 10.3390/pathogens10060746] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 06/04/2021] [Accepted: 06/08/2021] [Indexed: 11/16/2022] Open
Abstract
Endophytic, saprobic, and pathogenic fungi have evolved elaborate strategies to obtain nutrients from plants. Among the diverse plant-fungi interactions, the most crucial event is the attachment and penetration of the plant surface. Appressoria, specialized infection structures, have been evolved to facilitate this purpose. In this review, we describe the diversity of these appressoria and classify them into two main groups: single-celled appressoria (proto-appressoria, hyaline appressoria, melanized (dark) appressoria) and compound appressoria. The ultrastructure of appressoria, their initiation, their formation, and their function in fungi are discussed. We reviewed the molecular mechanisms regulating the formation and function of appressoria, their strategies to evade host defenses, and the related genomics and transcriptomics. The current review provides a foundation for comprehensive studies regarding their evolution and diversity in different fungal groups.
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Affiliation(s)
- K. W. Thilini Chethana
- Innovative Institute of Plant Health, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China;
- Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand; (R.S.J.); (Y.-J.C.); (S.K.); (P.D.A.); (D.G.)
- School of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand
| | - Ruvishika S. Jayawardena
- Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand; (R.S.J.); (Y.-J.C.); (S.K.); (P.D.A.); (D.G.)
- School of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand
| | - Yi-Jyun Chen
- Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand; (R.S.J.); (Y.-J.C.); (S.K.); (P.D.A.); (D.G.)
- School of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand
| | - Sirinapa Konta
- Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand; (R.S.J.); (Y.-J.C.); (S.K.); (P.D.A.); (D.G.)
- School of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand
| | - Saowaluck Tibpromma
- CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China;
| | - Pranami D. Abeywickrama
- Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand; (R.S.J.); (Y.-J.C.); (S.K.); (P.D.A.); (D.G.)
- School of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand
- Beijing Key Laboratory of Environment Friendly Management on Diseases and Pests of North China Fruits, Institute of Plant and Environment Protection, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
| | - Deecksha Gomdola
- Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand; (R.S.J.); (Y.-J.C.); (S.K.); (P.D.A.); (D.G.)
- School of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand
| | - Abhaya Balasuriya
- Department of Plant Sciences, Faculty of Agriculture, Rajarata University of Sri Lanka, Mihintale 50300, Sri Lanka;
| | - Jianping Xu
- Department of Biology, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4K1, Canada;
| | - Saisamorn Lumyong
- Center of Excellence in Microbial Diversity and Sustainable Utilization, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;
- Academy of Science, The Royal Society of Thailand, Bangkok 10300, Thailand
| | - Kevin D. Hyde
- Innovative Institute of Plant Health, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China;
- Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand; (R.S.J.); (Y.-J.C.); (S.K.); (P.D.A.); (D.G.)
- School of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand
- CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China;
- Center of Excellence in Microbial Diversity and Sustainable Utilization, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;
- Correspondence:
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Kim KW. Morphology and surface characteristics of the anamorphic stage of powdery mildew Erysiphe australiana on crape myrtle leaves. Micron 2021; 143:103013. [PMID: 33524914 DOI: 10.1016/j.micron.2021.103013] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Revised: 12/20/2020] [Accepted: 01/05/2021] [Indexed: 10/22/2022]
Abstract
The morphology and surface characteristics of the powdery mildew Erysiphe australiana growing on crape myrtle leaves were observed with field emission scanning electron microscopy. The powdery mildew infection caused distortion and withering of the leaves, and nearly all external parts such as flowers, petioles, and branches were covered by the whitish colonies. Hyphal proliferation was prevalent on the adaxial surface of the powdery mildew-infected leaves. Globose ascocarp initials with hyphal aggregations were frequently seen on the leaf surface. Collapsed conidia showed longitudinal striations or ridges on the surface and deep linear wrinkling. Foot-cells were straight and grew at right angles from the vegetative hyphae. The conidiophores had fragmented, cylindrical, non-chained conidia which were produced singly at the apex of the conidiophores. The germ tubes formed intercalary multi-lobed appressoria and the conidia produced filiform protrusions emerging from subterminal positions. This study visualized previously unknown structures of E. australiana such as the ascocarp initials, filiform protrusions on conidia, and multi-lobed appressoria on germ tubes. These observations will facilitate the identification and taxonomy of this fungus and its allied species.
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Affiliation(s)
- Ki Woo Kim
- School of Ecology and Environmental System, Kyungpook National University, Sangju, 37224, Republic of Korea; Tree Diagnostic Center, Kyungpook National University, Sangju, 37224, Republic of Korea.
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